Butterfly valve



FIG. 1 is a top perspective view of a butterfly valve showing our new design, in a first state in which the valve body is fully open;

FIG. 2 is a another top perspective view thereof;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is another perspective view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is a front elevational view thereof;

FIG. 9 is a top plan view thereof;

FIG. 10 is a bottom plan view thereof;

FIG. 11 is a top perspective view of the butterfly valve of FIG. 1, in a second state in which the valve body is closed;

FIG. 12 is a bottom perspective view thereof;

FIG. 13 is a left side elevational view thereof;

FIG. 14 is a right side elevational view thereof;

FIG. 15 is a rear elevational view thereof;

FIG. 16 is a front elevational view thereof;

FIG. 17 is a top plan view thereof; and,

FIG. 18 is a bottom plan view thereof. 

CLAIM The ornamental design for a butterfly valve, as shown and described. 